Welding Q125 Casing
Welding Q125 Casing
(OP)
We are building a fixture for surface testing of downhole equipment. Our client has furnished two joints of 9-5/8 Q125 casing. The fixture requires that flanged be welded to the ends of the joints. We only need the strength of A36 plate at the welded joint. What is a recommended welding process to achieve a sound weld?





RE: Welding Q125 Casing
RE: Welding Q125 Casing
RE: Welding Q125 Casing
RE: Welding Q125 Casing
RE: Welding Q125 Casing
Thanks
RE: Welding Q125 Casing
What I would say, just knowing Q125, would be Preheat 500F. Post heat 1000F.
Q125 will likely be in the 0.30-0.35%C range, with perhaps 0.8-1.0% Cr. so cracking without any Preheat is likely. I'd postheat above 950F since it could well have Vanadium (~0.05) and Molybdenum (~0.15) since they need to hold 125PSI min yield and have impact strength.
RE: Welding Q125 Casing
RE: Welding Q125 Casing
RE: Welding Q125 Casing